There's a good chance that the UK door locks are different so this may not work on non UK cars.

Bohumil contacted me to say it didn't work on his Czech 453.
The lights would flash fast as expected, the doors would still open from the inside.
Also, he found that the boot button no longer worked. The key button was the only way to open the boot.
Even after deactivating super lock, the boot button still wouldn't work.

After disconnecting the battery for 10 minutes and reattaching, the boot button worked again.